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Of course It's hard to beat the digital route. Amplitude and phase positioning are both versatile.

Cascade of D flip-flops energizes a weighted resistor network in the proper sequence. This simulation produces two waveforms by taking outputs at Q and bar-Q. Invert-gates introduce phase differences.

Amplitude and phase difference are fixed (theoretically) at all frequencies. To obtain 50kHz output, you must apply 800kHz clock. By adding DFF stages you can obtain better resolution.

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Link below runs schematic above using Falstad's animated interactive simulator.

Free to download and use.

tinyurl.com/2yt3vpy5